aDepartment of Ophthalmology, The First Hospital of Jilin University, Changchun, 130021, People's Republic of China, and bDepartment of Gastrointestinal Surgery, The First Hospital of Jilin University, Changchun, 130021, People's Republic of ChinaCorrespondence e-mail:doctorwangdg@163.com

In the title compound, {[Cu(C24H15N2O4)2(H2O)2]·4C3H7NO}n, the CuII ion, lying on an inversion center, is six-coordinated by two N atoms from two 4-[6-(4-carboxyphenyl)-4,4'-bipyridin-2-yl]benzoate (L) ligands, two deprotonated carboxylate O atoms from two other symmetry-related L ligands and two water molecules in a slightly distorted octahedral geometry. The CuII atoms are linked by the bridging ligands into a layer parallel to (101). The presence of intralayer O-HO hydrogen bonds and - interactions between the pyridine and benzene rings [centroid-centroid distances = 3.808 (2) and 3.927 (2) Å] stabilizes the layer. Further O-HO hydrogen bonds link the layers and the dimethylformamide solvent molecules.

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